Throughout the movie, it is clearly shown that privacy is not necessarily a thing in this society. Here are some specifics:
Supernatural beings have their minds read to obtain visuals and audio on murders
These recordings are saved in full to allow people with access to review them, exposing potentially detrimental information regarding an innocent party.
Advertisements are targeted, even in public. Billboards and posters will call people by their name, showing that basic information privacy essentially doesn't exist.
People are not required to consent to a search of their personal space, even if said person is a completely innocent party.
At the end of the movie, Anderton hacks into displays all over the city to expose his former director for his crimes, questioning the ethicallity of hacking a broadcast to expose someone.
Individuals are not welcomed to a trial, and their fate is determined purely by the Precog vision. This brings up the question if an innocent person could be imprisoned for a self defense incident, or if the sight is even real.
Is it ethical to search someone based purely on suspicion that there may be a link to a crime even if said person is completely unaware of the on going case?
In the movie during the major apartment complex search scene, it appears innocents are used to such investigations, as when scanned they proceed as if nothing happened.
When individuals are convicted, they are placed in a prison cell that puts them into a "Cryogenic-like" state. Is it ethical to treat people this way? Are traditional prisons more or less ethical?